Canadian Journal of Chemistry
·
2018
·Vol. 97
·期 2
·
IF 1.084
Tian Gan,Zhikai Wang,Mengru Chen,Wanqiu Fu,Haibo Wang,Junyong Sun
In this work, the Ag@Cu particles with yolk–shell nanostructure was prepared by facile solvothermal method, which was modified on glassy carbon electrode (GCE) to fabricate electrochemical sensor for the convenient and fast determination of p-aminobenzoic acid (PABA). The surface morphology and electrochemical properties of the as-prepared Ag@Cu nanocomposite modified electrode were characterized by scanning electron microscopy, transmission electron microscopy, chronocoulometry, and electrochemical impedance spectroscopy. Further, the electrochemical sensing of PABA was performed on the Ag@Cu/GCE using cyclic voltammetry and differential pulse voltammetry techniques, showing high catalytic activity. Under the optimal conditions, the sensor exhibited a wide linear range, high sensitivity, and low detection limit of 0.315 μmol/L for PABA. The developed sensor was also successfully applied for PABA detection in anesthetic and cosmetics with satisfactory results.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tao Zhang,Yan Liu,Chuncheng Yang,Limei Tian,Yuying Yan,Guoyong Wang
Besides composition , the electrochemical CO 2 reduction reaction (CO 2 RR) is also very sensitive to the structure of catalyst due to the complex intermediates. In this paper, a series of Cu-Ag biphasic catalysts with a similar average value of unimodal phase size distribution were synthesized. The phase interface area of the biphasic catalyst can be manipulated by the element ratio due to the unimodal phase size distribution. The catalytic performances of Cu-Ag biphasic catalysts for CO 2 RR to CO were studied and it is found the conversion selectivity heavily depends on the phase interface area. The maximum phase interface makes the original inert copper catalyst have excellent electrochemical performance . A high FE CO of 80.25% was attained with a partial current density of − 4.88 mA cm −2 at − 0.9 V vs RHE in Cu 50 Ag 50 and the FE CO was almost not attenuated within 25 h. The catalytic performances are even better than those of Ag 100 catalyst. The paper enlightens another way to reduce the dependence of electrochemical catalyst on noble metals. The phase interface can be further increased with less noble metal element proportion, for the methodology of this paper ignores the thickness of the phase.
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Russian Journal of Physical Chemistry A
·
2026
·Vol. 100
·期 10
·2407-2418
·
IF 0.7
Xuan Liu,Huang Jinliang,Guo Feifei,Chang Liangliang,Zhou Chunsheng,Xi Zengzhe
This study presents a novel strategy to significantly enhance the piezocatalytic performance of BiFeO 3 for antibiotic degradation by integrating cation co-doping and noble metal decoration. To address the inherent limitations of rapid charge recombination and insufficient active sites in pristine BiFeO 3 , Gd, and Zr co-doped BiFeO 3 (BGFZ9) NPs were first synthesized via a sol-gel method. Subsequently, Ag NPs were uniformly deposited on the BGFZ9 surface through a facile photochemical reduction process to construct Ag/BGFZ9 nanocomposites. Comprehensive characterizations including XRD, XPS, TEM, and VSM confirmed the successful formation of the perovskite structure, uniform dispersion of Ag NPs, and tailored magnetic properties. The optimized Ag2/BGFZ9 catalyst demonstrated remarkable piezocatalytic and piezo-photocatalytic activity towards ofloxacin, achieving degradation efficiencies of 82.54 and 86.98% within 120 min under ultrasonic and combined ultrasonic/visible-light irradiation, respectively. The corresponding first-order rate constants were 0.0147 and 0.0164 min –1 , representing a significant enhancement over the undoped and unmodified counterparts. The superior performance is attributed to the synergistic interplay of multiple factors: (1) the Gd/Zr co-doping induced lattice distortion and optimized band structure, enhancing the intrinsic piezoelectric response; (2) the formation of a Schottky junction at the Ag/BGFZ9 interface, which acted as an efficient electron sink to suppress charge carrier recombination; and (3) the LSPR effect of Ag NPs under visible light, which broadened light absorption and generated hot electrons. Radical trapping experiments and EPR spectroscopy identified \( \bullet {\kern 1pt} {\text{O}}_{2}^{ - }\) and \( \bullet {\kern 1pt} {\text{OH}}\) as the primary reactive oxygen species. The catalyst maintained 82.13% of its initial activity after five consecutive cycles, demonstrating excellent stability and magnetic recoverability. This work elucidates a synergistic piezoelectric-plasmonic coupling mechanism and provides a viable design principle for developing efficient, stable, and magnetically separable multiferroic catalysts for advanced oxidation processes in wastewater remediation.
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RSC Advances
·
2024
·Vol. 14
·期 9
·6048-6057
·
IF 3.9
Hu Sun,Xianglei Yu,Siqi Quan,Weichao Li,Zhuo Qian,Junpeng Li,Guoyou Gan
Environmental protection mandates have spurred the widespread adoption of lead-free glass in electronic material adhesion. Glass powder, crucial for solar silver paste, notably affects the ohmic contact at the Ag–Si interface of crystalline silicon solar cells. This study examines how TeO2 content influences the high-temperature flowability and wettability of lead-free Bi2O3–TeO2-based glass powder, alongside the interplay between the glass's thermal properties and interface contact. Additionally, it investigates the Bi2O3–TeO2 ratio's impact on current transmission through the interfacial glass layer. Experimental results show that the synthesized glass powder exhibits superior high-temperature flowability and wettability, with a low contact resistance of 1.5 mΩ cm2 in silver paste applications. This study also proposes an optimal approach for enhancing current transmission through the interfacial glass layer. Consequently, this glass powder is highly valuable for c-Si solar cell silver paste applications, offering novel insights into improving current transmission efficiency.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Dan Yan,Qinke Yao,Fei Yu,Liangbo Chen,Siyi Zhang,Hao Sun,Jinyou Lin,Yao Fu
Corneal and conjunctival infections are common ocular diseases, sometimes, causing severe and refractory drug-resistant bacteria infections. Fungal keratitis is a leading cause for blindness and traditional medical treatment is unsatisfactory. Thus, there is an urge to develop a new therapy to deal with these cases. In this study, we developed surface modified poly(lactic acid) (PLA) electrospun nanofibrous membranes (EFMs) with silver nanoparticles (AgNPs) and cellulose nanofibrils (CNF) as scaffolds for cell proliferation and antimicrobial application. The AgNPs with a very low content (below 0.1%) were easily anchored on the surface of PLA EFMs by CNF, which endowed the scaffold with hydrophilicity and antibacterial ability. The in-vitro cell co-culture experiments showed that the scaffold had great biocompatibility to ocular epithelial cells, especially the scaffolds coated by CNF, which significantly proliferated cells. Furthermore, the antibacterial activity could reach >95% inhibiting Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) due to the implantation of AgNPs, and the antifungal activity was also outstanding with most of the Fusarium spp. inhibited. Hence, the developed PLA EFMs with CNF and AgNPs are promising ocular bandages to promote cell proliferation and kill infectious pathogens, exhibiting potential applications in ocular wound healing in the future.
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Materials Today Energy
·
2026
·
IF 8.1
Yipeng Nie,Longquan Deng,Zipei Cui,Zhao Jiang,Wenchao Sheng
Coupling hydrogen evolution reaction (HER) with glycerol oxidation reaction (GOR) in a hybrid electrolyzer represents a highly promising approach for green hydrogen production and glycerol upgrading. However, the limited activity and stability of existing GOR catalysts restrict the energy efficiency of the coupled system. In this study, Pd/C and Pd 4 Ag x /C catalysts were synthesized to investigate the impact of Ag on the activity and stability of Pd-based catalysts for GOR. The optimized Pd 4 Ag 8 /C demonstrated a specific activity of 17.4 ± 0.1 mA cm −2 Pd and a mass activity of 13.2 ± 0.3 A mg −1 Pd , both being more than 10 times higher than those of Pd/C. Combined results of ultra-performance liquid chromatography and density functional theory calculations revealed that the introduction of Ag promotes C−C cleavage in glyceric acid on Pd sites, facilitating electron transfer in GOR and thereby enhancing the GOR activity. The GOR coupled HER hybrid electrolyzer using Pd 4 Ag 8 /C as the GOR catalyst achieved a significant reduction of ∼1.07 V in cell voltage compared to conventional water electrolysis system at a current density of 10 mA cm −2 with a favorable operational stability, and realized the production of high-value-added chemicals, demonstrating the promising potential in both hydrogen production and upgrade of glycerol.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.1
Jiayan Xu,Hanlu Wang,Chenyi Yuan,Qiuyue Fu,Sizeng Bao,Guicai Fan,Lingling Bao,Chenjie Gu,Tao Jiang,Xueyan Bian
Surface-enhanced Raman scattering (SERS) has emerged as a powerful analytical technique for the sensitive point-of-care detection of anti-phospholipase A2 receptor antibodies (anti-PLA2R-Abs), a primary biomarker for membranous nephropathy (MN). However, conventional SERS substrates lack the integrated sample enrichment capability and flexible format required for efficient and convenient clinical analysis. To address this limitation, we hypothesized that an immersion-type flexible SERS medium based on conventional cotton swab could be developed for ultra-sensitive on-site detection of anti-PLA2R-Abs. Through a precisely controlled in-situ synthesis and a following ion sputtering, we engineered a ZIF-67/Ag nanocomposite on the nanofiber structure of a cotton swab, which combined molecular enrichment capability with dual signal enhancement mechanisms. The fibrous architecture of the cotton swab enabled highly efficient anchoring of biomarker-containing liquid samples, offering a significant advantage over silicon wafers. A substrate was yielded to exhibit not only outstanding SERS activity with an enhancement factor (EF) of 3.51 × 10 8 but also excellent uniformity and reproducibility. Using this structure, a quantitative assay of anti-PLA2R-Abs was facilitated across five orders of magnitude (1 × 10 −4 to 1 × 10 −9 mg/mL), achieving a limit of detection (LOD) as low as 0.185 ng/mL. Moreover, its diagnostic efficacy was further validated in clinical samples. This work presents a clinically viable point-of-care diagnostic platform that simplifies sample processing while significantly enhancing detection sensitivity for nephrology applications, thereby contributing to the advancement of point-of-care diagnostics.
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Surfaces and Interfaces
·
2026
·
IF 6.3
Yue Zhao,Zhaotian Ba,Yu Long,Yuanyi Kang,Tao Zhang,Meng Xin,Guohua Fan,Chuncheng Hao
The performance contradiction between dielectric constant and breakdown strength restricted the significant improvement in energy storage density of common dielectrics. In this work, the ternary BaTiO 3 @Ag/PVDF composites were prepared, in which the fibrous BaTiO 3 fillers were prepared by electrospinning and further modified with silver (Ag) nanoparticles via silver mirror reaction. Dielectric performance of the composites was effectively improved by the hybrid fillers owing to the synergies of the increased polarizations and the Coulomb blockade effect. Dielectric constant and breakdown strength of the composites with only 0.2 wt% filling content reached 14.8 and 421.7 MV/m, which were respectively increased 124.4% and 135.9% compared to that of the pristine PVDF. And the maximum energy storage density was increased to 4.5 J/cm 3 with the ultra-low content of fillers. This work broke the inherent contradictions in single-layer composites and provided novel attempts for dielectric modulation of dielectrics.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 6
·383
·
IF 5.4
Hu Rongjing,Fu Shilan,Zhang Jingwen,Zhang Jiadan,Fu Fengfu,Lin Zhenyu,Dong Yongqiang
A new method is developed to synthesize Au/Ag alloy nanoparticles (Au/Ag-NPs). The obtained Au/Ag-NPs are further dispersed in polyvinyl alcohol (PVA) solution to construct Au/Ag hydrogel surface enhanced Raman scattering (SERS) chips through a simple Ca 2+ -mediated aggregation of Au/Ag-NPs and a physical crosslinking of PVA. The formed aggregated Au/Ag-NPs (a-Au/Ag-NPs) show a strong localized surface plasmon resonance corresponding to the commonly used 532 nm laser. Therefore, under the action of 532 nm laser, the abundant nanogaps contained in the a-Au/Ag-NPs turn to high active electromagnetic “hot spots”, providing strong electromagnetic enhancement (EM). Moreover, Au/Ag-NPs provide a moderate Fermi level of -4.72 eV, which facilitates its photo-induced charge transfer with many molecules under 532 nm laser irradiation, resulting in the chemical enhancement (CM) effect. The synergistic effect of EM and CM leads to ultrahigh SERS activity. Additionally, the unique structure of hydrogel provides excellent signal uniformity and robust anti-interference ability. Thus, the obtained Au/Ag hydrogel SERS chips are ideal SERS platform for the quantitative determination of many molecules. For instance, a sensitive and reliable SERS method is established for the simultaneous detection of methyl parathion and triazophos in fruits and tea. Graphical The alternative text for this image may have been generated using AI.
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LANGMUIR
·
2026
·Vol. 42
·期 29
·21139-21154
·
IF 4.4
Mai Quan-Doan,Dang Thi Hanh Trang,Tran Van Tiep,Ngo Thi Loan,Ong Van Hoang,Cao Thi Hong,Nguyen Quang Hoa,Lich Le Van,Nguyen Cong Chi,Mai Xuan Trang,Phan Manh-Huong,Pham Anh-Tuan,Le Anh-Tuan
Surface-enhanced Raman spectroscopy (SERS) is a powerful
analytical
technique capable of providing rapid and noninvasive molecular fingerprint
identification through characteristic vibrational signatures. However,
developing SERS platforms that enable both ultrasensitive and highly
selective detection, particularly for molecules with intrinsically
weak Raman responses, remains a major challenge, yet it is highly
desirable for expanding the currently limited application scope of
SERS. Herein, we introduce a novel plasmonic porous multicore@shell
Ag@UiO-66 nanostructure that synergistically integrates the localized
surface plasmon resonances (LSPRs) of Ag nanoparticles (NPs) with
the selective molecular capture capability of the metal–organic
framework UiO-66. The hybrid structure is fabricated via a simple
solvent-induced self-assembly strategy, enabling in situ formation
of UiO-66 around dispersed AgNPs at room temperature. The resulting
architecture immobilizes multiple AgNP cores within a porous UiO-66
shell matrix, simultaneously stabilizing their plasmonic activity
and generating abundant interparticle hotspots. More importantly,
the UiO-66 shell provides molecular recognition toward salicylic acid
(SA─a bioactive aromatic compound) through synergistic adsorption
interactions involving bidentate coordination with Zr nodes, hydrogen
bonding, and π-π interactions. This cooperative plasmonic-molecular
recognition mechanism effectively concentrates target molecules at
electromagnetic hotspots, leading to significantly enhanced SERS signals.
As a result, the developed platform achieves highly selective and
ultrasensitive detection of SA with a detection limit down to 1 nM,
far surpassing that of traditional SERS substrates (∼1 μM).
Furthermore, machine learning-assisted spectral analysis confirms
the reliable and selective identification of SA in complex mixtures.
This work demonstrates an effective strategy for developing MOF-enabled
selective and ultrasensitive SERS platforms, opening new avenues for
advanced molecular sensing applications.
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npj Flexible Electronics
·
2026
·
IF 15.4
Cai Yanzhi,Ding Hui,Cheng Laifei,Yin Hongfeng,Chen Dengpeng,Bai Mingshu,Chen Xiaohang,Qian Xinyu,Jiang Yunge,Wei Fanfan
This study addresses key challenges of long-term stability, wide range, and high sensitivity in piezoresistive strain sensors by developing a multilayer composite. A parallel circuit is constructed using carbon nanotube@silver nanoparticles-MXene (CNT@AgNPs-MXene) and expanded graphite (EG) double sensing layers, exploiting EG’s interlayer sliding and recovery capability derived from its wide layer spacing, and is integrated with a thermoplastic polyurethane (TPU) support layer. This design provides complementary current pathways, where a redundant path is offered by the other layer when one layer breaks. The resulting CNT@AgNPs-MXene/EG/TPU trilayer (double sensing layers with a TPU support) achieves stable operation over 150,000 cycles, a working range of 630% (709% mechanically), and a maximum GF of 4091.74. In comparison, the EG/TPU bilayer (single EG layer with a TPU support) is also stable for 150,000 cycles and exhibits a higher maximum GF (16083.30) but a narrower working range (245%). Consequently, each sensor holds a distinct performance edge. The bilayer excels at detecting ultra-fine motions, while the trilayer is advantageous for large-strain scenarios. Both sensors reliably monitor diverse human motions and maintain long-term stability in harsh environments (fresh water, sweat, alkaline/acidic conditions). This work provides a new strategy for high-performance, durable sensors for harsh environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Wenbao Huang,Houfen Li,Zhiyi Dang,Shibo Xu,Rong Han,Rui Li,Aijuan Zhou,Xiuping Yue,Xu Zhao,Jiancheng Wang
Persulfate-assisted visible-light photocatalysis shows promise for refractory organic pollutant degradation but is limited by low charge separation/utilization in conventional catalysts. Leveraging the unique charge-separation capability of Schottky junctions and the tunable surface charge properties of ferroelectric materials, this study innovatively constructs a polarized BiFeO 3 -Ag (BFOA*) Schottky junction catalyst to drive the synergistic persulfate (PS)/visible-light (VIS) catalytic degradation of quinoline. Comprehensive characterization confirms the formation of the BiFeO 3 -Ag Schottky junction. Pronounced hysteresis loops and distinct domain structures observed via piezo-response force microscopy (PFM) demonstrate that corona poling induces a stable built-in ferroelectric polarization field. In the VIS/PS/BFOA* system, the polarized catalyst achieves 98.8 ± 1.1% quinoline degradation within 90 min, significantly outperforming its unpolarized counterpart (88.1 ± 4.0%), while maintaining excellent cycling stability and markedly reduced effluent toxicity. Mechanistic investigations and DFT calculations reveal that ferroelectric polarization facilitates directional electron migration through the Schottky junction, while the Schottky barrier suppresses the backflow of the photogenerated electrons, thereby synergistically improving charge carrier separation. Simultaneously, ferroelectric polarization–induced charged surface sites promote the adsorption and activation of PS. This dual function results in abundant reactive species (h + , ·O 2 − , SO 4 · − , ·OH), which are responsible for the efficient quinoline degradation. This work highlights ferroelectric polarization engineering as a pivotal strategy for strengthening Schottky junction catalysts and establishes it a viable approach for designing sustainable advanced oxidation processes in wastewater treatment. Download: Download high-res image (193KB) Download: Download full-size image
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